if语句报错

爱吃爱吃

运用if 语句报错
do i=0,240
do j=0,288
do k=0,4
if ((ttestv(k,i,j).ge.0.).and.(ttestv(k,i,j).le.0.5)) then

nu=ttestv(k,i,j)
testv(k,i,j)=nu

else
testv(k,i,j)=-9999
end if
end do

end do
end do

fatal:The result of the conditional expression yields a missing value.
>> NCL can not determine branch, see ismissing function
这是因为里面的变量数ttestv有的是缺省值，所以if不能判断报错，只需要加上(.not.ismissing(ttestv(k,i,j))).，即


do i=0,240
do j=0,288
do k=0,4
if ((.not.ismissing(ttestv(k,i,j))).and.(ttestv(k,i,j).ge.0.).and.(ttestv(k,i,j).le.0.5)) then

nu=ttestv(k,i,j)
testv(k,i,j)=nu

else
testv(k,i,j)=-9999
end if
end do

end do
end do

爱吃爱吃

ncl用变量代替报错
do i=0,240
do j=0,288
do k=0,4
if ((.not.ismissing(ttestv(k,i,j))).and.(ttestv(k,i,j).ge.0.).and.(ttestv(k,i,j).le.0.5)) then
testv(k,i,j)=ttestv(k,i,j)
else
testv(k,i,j)=-9999
end if
end do
end do
end do
报错fatal:Assignment type mismatch, right hand side can't be coerced to type of left hand side但是不影响运行。
只要把里面的testv(k,i,j)=ttestv(k,i,j)改成
nu=ttestv(k,i,j)
testv(k,i,j)=nu

因为不能两个变量等，需要有个缓冲